create table customer(
	id number(5)primary key,
	cname varchar2(20),
	age number(2)
);
create sequence jgh_seq01;

insert into customer (id,cname,age)
values (jgh_seq01.nextval,'john',10);
insert into customer(id,cname,age)
values (jgh_seq01.nextval,'tom',21);

select * from customer;







